Step 2: Check Whether Your Windows Is Activated Since Windows 10 clean install will delete all files, settings, and apps on your computer, it is necessary to back up your data beforehand. In this part, you can find the necessary things you should do before and during Windows 10 21H2 clean install. You can also use Windows 10 Media Creation Tool to create a Windows 10 ISO file, burn it to USB, and clean install Windows 10 via the bootable USB drive.You can use Windows 10 Media Creation Tool to create a bootable USB drive and clean install Windows 10 from the USB drive.Well then, how to get a bootable USB medium? Usually, you need to clean install Windows 10 from a bootable USB drive. Windows 10 clean install will remove all files, settings, and applications on your computer during the Windows 10 installation process. Read More What Does Windows 10 Clean Install Do?